Frequent Questions

EPA has approved the use of EPA Method 218.6, as modified by Dionex Corp. Application Update 144, for analysis of hexavalent chromium (chromium-VI) in drinking water. Currently, EPA is temporarily recommending an extension of the maximum holding time for

As indicated in the method, the samples should be filtered and buffered as soon as practical. These operations can be performed in the field; however, if it is more practical to instead ship them to a laboratory first, then the samples can be filtered and buffered there. If samples are sent to a laboratory first, filtering and buffering should be performed as soon as practical. The samples should not be held at the laboratory to be filtered and buffered at the time of analysis.